Method and apparatus for transmitting synchronization signal for device to device communication in wireless communication system
AssigneeInnovative Technology Lab Co., Ltd.
InventorSung Jun Yoon
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Abstract
Exemplary embodiments provide a method and apparatus for transmitting a synchronization signal for Device-to-Device (D2D) communication in a wireless communication system. With respect to a D2D synchronization source to transmit a synchronization signal for D2D communication, the method includes: generating a D2D Synchronization Signal (D2DSS); and transmitting, by a synchronization source, the D2DSS to a D2D reception (Rx) UE, wherein the D2DSS includes a Primary D2D Synchronization Signal (PD2DSS) generated based on information associated with the synchronization source.
Claims17
A first user equipment (UE) to transceive a synchronization signal, the first UE supporting a device-to-device (D2D) communication between UEs, the first UE comprising:
- a receiver to receive a synchronization signal transmitted from a synchronization source;
- a processor to determine a root index based on the received synchronization signal, and to determine a synchronization timing reference based on the root index;
- and
- a transmitter to transmit a synchronization signal for a D2D communication based on the determined synchronization timing reference,
- wherein for the determining of the synchronization timing reference, the processor:
- based on the root index, determines a category of the synchronization source,
- prioritizes the synchronization source based on determining whether the synchronization source is an evolved NodeB (eNodeB), a UE synchronized with an eNodeB, or a UE having a synchronization timing reference independent from an eNodeB, and
- determines the synchronization timing reference based on the prioritization;
- and
- wherein for the transmitting of the synchronization signal for a D2D communication, the processor:
- generates the synchronization signal for a D2D communication based on a set for in-coverage (D2DSSue_net) when an eNodeB or a UE synchronized with an eNodeB is selected as a transmission synchronization source for the determined synchronization timing reference, and
- generates the synchronization signal for a D2D communication based on a set for out-of-coverage (D2DSSue_oon) when a UE having a synchronization timing reference independent from an eNodeB is selected as the transmission synchronization source.
A first user equipment (UE) to transceive a synchronization signal, the first UE supporting a device-to-device (D2D) communication between UEs, the first UE comprising:
- a receiver to receive synchronization signals transmitted from different synchronization sources, respectively;
- a processor to prioritize the different synchronization sources based on categories of the different synchronization sources, the categories comprising an evolved NodeB (eNodeB), a UE synchronized with an eNodeB, and a UE having a synchronization timing reference independent from an eNodeB, to determine a reference synchronization source for the first UE among the different synchronization sources, to synchronize with the reference synchronization source based on a synchronization timing reference associated with the reference synchronization source, to determine a root index based on a primary D2D synchronization signal received from the respective synchronization source, and to determine one of 168 identities corresponding to a set for in-coverage (D2DSSue_net) or one of 168 identities corresponding to a set for out-of-coverage (D2DSSue_oon) based on a secondary D2D synchronization signal received from the respective synchronization source;
- and
- a transmitter to transmit a signal based on the synchronization.
A first user equipment (UE) to transceive a synchronization signal, the first UE supporting, a device-to-device (D2D) communication between UEs, the first UE comprising:
- a receiver to receive a synchronization signal transmitted from a synchronization source;
- a processor to determine a root index based on the received synchronization signal, and to determine a synchronization timing reference based on the root index;
- and
- a transmitter to transmit a synchronization signal for a D2D communication based on the determined synchronization timing reference,
- wherein for the determining of the synchronization timing reference, the processor:
- based on the root index, determines a category of the synchronization source,
- prioritizes the synchronization source based on determining whether the synchronization source is an evolved NodeB (eNodeB), a UE synchronized with an eNodeB, or a UE having a synchronization timing reference independent from an eNodeB,
- determines whether the synchronization source is a UE located in a coverage of an eNodeB or a UE located out of a coverage of an eNodeB, among UEs synchronized with an eNodeB,
- prioritizes the synchronization source further based on determining whether the synchronization source is a UE located in a coverage of an eNodeB or a UE located out of a coverage of an eNodeB, and
- determines the synchronization timing reference based on the prioritization.
Dependencies are inferred from the claim text.